The general law that I have always heard is:
If you find something, turn it in to the Police Department. And if after 30 to 90 day’s it isn’t claimed, it’s the finders. But lots of cities, counties and states are different.
But, I also heard that some PD’s auction off items that have been turned in and they keep the proceeds.
The best thing to do is not detect in illegal areas and keep you mouth shut about high dollar finds. A few guys found a huge meteorite and the Government claimed it under the 1906 Antiquates Act. If you want to read about the case, search for the Old Woman Mountains Meteorite. It was found by three prospectors, it was on public land, and they tried to claim it under the 1886 Mining Law, it didn’t work.
HH
I think you know to do now.